ouchengeng created HIVE-22669:
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Summary: Do not initiate Deserializer for DescTable operation when
it's not needed
Key: HIVE-22669
URL: https://issues.apache.org/jira/browse/HIVE-22669
Project: Hive
Issue Type: Improvement
Components: Clients, Hive
Affects Versions: 3.0.0
Reporter: ouchengeng
Assignee: ouchengeng
For `desc table ` queries, DescTableOperation always creates a Deserializer
object, even though it's not often needed.
What often is that if a table is backed on some particular SerDe class, uses
have no chance to `desc table` without adding that jar file. With this patch,
users at least are able to desc tables when they only need metadata of the
table, especially in an open Hive environment.
For above two reasons, it's better to create Deserializer object when it's
needed.
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